THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL

CERTIFICATE OF SECONDARY EDUCATION   EXAMINATION 033/1 BIOLOGY   1

 TIME: 3     HOURS Wednesday, 05   ^th    October 2011     a.m.

INSTRUCTIONS

1. This paper consists of three sections A, B and C.

2. Answer all questions from sections A and B and one (1) question from section C.

3. Read each question carefully before you start answering it.

4. Except for diagrams that must be drawn in pencil, all writings should be in blue/black ink or ball point pen.

5. Calculators are not allowed in the examination room.

6. Cellular phones are not allowed in the examination room.

7. Write your Examination Number on every page of your answer booklet(s).

SECTION A (20 MARKS)

Answer all questions in this section, each question carries 10 marks.

1. For each of the items (i) – (x) choose the correct answer from among the given alternatives and write its letter beside the item number.

(i) How many gametes are produced from one cell during meiosis?

1.  Two
2.  Four
3.  Six
4.  Eight
5.  Ten

(ii) Which of the following is not an excretory product in plants?

1.  Tannins
2.  Carbon Dioxide
3.  Urea
4.  Calcium oxalate
5.  Latex

(iii) Why are skeletal muscles usually found in opposing pairs?

1.  One muscle alone cannot extend a joint
2.  Muscles can only work by contraction
3.  One muscle alone cannot flex a joint
4.  Paired muscles are stronger
5.  Muscles normally work in antagonistic fashion

(iv) Which of the following bests defines allergy?

1.  Body reaction to antigen
2.  Body reaction against a specific drug
3.  Body reaction against a disease­causing micro­organism
4.  Accumulation of mucus caused by inhaling dust particles
5.  Formation of rash caused by eating specific foods

(v) When students were conducting private study at night, lights went off completely. Which of the following changes occurred in the eyes of the students?

1.  The lens became thicker
2.  The pupil became larger
3.  The ciliary muscle relaxed
4.  The lids close
5.  The eyes opened wider

(vi) Select the item that indicates the best match in vitamin­deficiency:

1.  Vitamin A dry scaly skin
2.  Vitamin B loss of appetite and yawning
3.  Vitamin C anemia and high blood pressure
4.  Vitamin D soft deformed bones
5.  Vitamin K poor night vision

(vii) Which of the following is formed immediately after fertilization?

1.  Placenta
2.  An embryo
3.  A foetus
4.  Amniotic fluid
5.  A zygote

(viii) The human ovary secretes hormones known as:

1.  Oestrogen and testosterone
2.  Progesterone and testosterone
3.  Oestrogen and lactogen
4.  Oestrogen and progesterone
5.  Follicle stimulating hormone and progesterone

(ix) The offspring of crosses between red flowered and white flowered plants were always found to be pink. This is an example of:

1.  Crossing over
2.  Mutation
3.  Co-dominance
4.  Incomplete dominance
5.  Natural selection

(x) At early stages of development of the human zygote which organ develops first?

1.  Liver
2.  Heart
3.  Kidney
4.  Eyes
5.  Notochord